<p>^ do u remember more details of the question</p>
<p>**Are curves relative to the test date? ** Is the December test date curve better than other test dates by any chance? (bc the AP bio people aren’t taking it at December or something?) :)</p>
<p>The curve was -3 for a min 800 raw score in the CB official practice tests…and i felt this test was harder than the practice test in CB … so hopefully it’s -4 or -5! hope hope hope hope hopeeeeeeee</p>
<p>@ adamonkey</p>
<p>would water going in mean other water going out? like circular flow of water…
and also for lichen and moss, wouldn’t pioneer organisms only apply to soil that is completely uninhabitated by organisms previously or something? because i don’t think a fire would make the entire ecological succession start over again. </p>
<p>it may be stationary for a bit (or in my case of reasoning go back a step to conifers :P) but it wouldn’t start over? not sure.</p>
<p>Adamonkey, the question about caffeine said that it contained ADH. So, the more coffee you drink the more ADH you ingest. Therefore, more water reabsorption–> more concentrated urine</p>
<p>caffeine does not contain ADH, lol… ADH is a hormone. caffeine is a strong diuretic and inhibits ADH levels.</p>
<p>@potentenum:
-i think you might be right about the fire one. i never learnt anything about ecological succession in class; forgot about the possibility of secondary succession.</p>
<p>M curve was slightly more lenient, at 76-75 = 790 and then the same pattern of going down later on. </p>
<p>I think this practice test was a lot easier than the one in the actual administration. dno, maybe because I wasn’t under pressure for the practice test. I had 10 minutes leftover after I finished everything. </p>
<p>For the test, I had only 5 minutes over to check over things, and I also wasn’t sure of many questions. </p>
<p>Dun dun dunnnn. Hope the curve is better… If its -3 I probably already lost the 800. Sighz.</p>
<p>aall i noe bout ecological succession is that lichen/moss = pioneer organisms, and climax community are those hardwood trees. i think the environment was already at the climax community, and then it got burned. but i remember reading somewhere once its at climax community a lot more than a fire has to happen to make it return to lichens or something. </p>
<p>and that a climax community was “stable” blah blah, was gonna stay there. </p>
<p>so i was between conifers, or hardwood trees… dno. i saw a picture on wikipedia where 1 year after a fire the dead trees had grass around them, so dno bout that… maybe its grasses? o=</p>
<p>I have a question regarding the concentration question. (10% outside, 5% inside - general consensus was water moves inside.) </p>
<p>My reasoning (which, I if I remember correctly, was an answer to one of the questions?) was as follows:</p>
<p>If the question is describing the relative concentration of the solvent in the water (I forget what the molecule was), water concentration is inverse. As PR puts it: “…water’s concentration gradient is opposite to the solute (dissolved particles)” </p>
<p>Thus, a 10% concentration outside the bag leave less space for water, while the 5% inside leaves more. So, following simple osmotic diffusion - water leaves the bag and goes outside.</p>
<p>If I made a mistake (and judging by the consensus, I did) feel free to laugh hysterically at me. Haha, I’m pretty much shooting for a 600+ at this point.</p>
<hr>
<p>On another note: The question about Archaea/Eukarya similarity generated a lot of controversy. After doing some Googleing, I’m pretty sure the correct answer is that they have similar DNA. </p>
<p>From Annual Review:
“Most archaeal proteins participating in DNA replication are more similar in sequence to those found in eukarya than to analogous replication proteins in bacteria.”
From PR:
“[Archaea] have some featers in common with eukaryotes…multiple types of RNA polymerase and methionine as the initiator amino acid…”</p>
<p>I have no idea what I put for the salt concentration one. but either way, it’ll be pretty sad if I end up missing that one because it seems so easy! </p>
<p>wasn’t it talking about surcros solution? so there’s more sucros on the outside (10% outside? or inside?) whichever place had 10% sucrose was where the water was moving to right? </p>
<p>as for the archaea/eukarya question,… what was the question? don’t remember it. </p>
<p>@ potentenum: “whichever place had 10% sucrose was where the water was moving to right?”
Yeah. But i think a lot of people here said 10% -> 5% because of high to low concentration. But 10% is MORE concentrated in sucrose and thus has LESS space for water. 5% is LESS concentrated and has MORE space for water. So, with respect to sucrose concentration it would diffuse from 5% (more water) —> 10% (less water). </p>
<p>I read that inverse rule in PR. It is possible that I am mistaken, however. Judging by what people are saying here at CC, I am.</p>
<p>Sorry for all the over-complication -.- …it’s just one problem so w/e. </p>
<p>__</p>
<p>As far as the Archaea/Eukarya problem goes. It was asking the reason for why Archaea was more similar to Eukarya than to Bacteria. After Googleing, I believe the answer was that they have more similar DNA.</p>
<p>I’m hoping for a lenient curve…haha something like:</p>
hope hope hope hope hopeeeeeeee</p>
don’t remember it. </p>